thropp



Feb. 27, 1923. H

-J. W. THROPP.

sum STOP FOR MACHINERY.

3 SHEETSSHEET h FILED JULY L \920.

Feb. 27,1923. 1. w. THROPP. SAFETY STOP FOR MACHINERY.

3 SHEETS-SHEET 2.

FILED JULY-7,1920- Feb.-27, 1923.

I J. W THRO'PP.

SAFETY STOP FOR MACHINERY.

FILED JULY 1,1920.

Patented Feb. 27, 1923.

UNITE an smarts PATENT UFFLCE.

JOSEPH W. THROPP; TEEN-TON, NEW JERSEY.

SAFETY STU F03 MACHINERY.

'Am licationkfiledluly 7, 1320. Serial'N'c. 394,526.

citizem ofthe United States, residing in ldrentom Mercen County, New Jersey, I have invented: certain. Improvements in Safety stops; foi lllachinery, of which the foliowing is. a specification.

The: object of. my intention is to provide a. mechanicaland. electrical'saf'ety stop' for machinery which. can be actuated. to stop a machineinstantly, should an accident occur.

I: haveilustrated my invention in connection with :themixing' rolls of a rubber mill, but it will beunderstood-that my. invention can: be used inconnection. with any machine which cannot be properly protected by-the ordinary guards; 7

The invc'nti'on'is especially adapted tosbe used in ccimection with. machines where exposed: rolls are necessary so that in the event of an operator being caught in: the. rolls v or in: the? machineryconnected therewith, an arm, or a portion. of the body, will come in contact with the-mechanism, actuating-an electricv switch andstopping the machine instantly.

In the accompanying drawings:

Fig; 1 is a front elevation illustrating my improved safety device. in connection with,

a' roller mixing machine;

F 2 is an end view;

Fig. 3isdetached view, showing; the brake release mechanism; a

Figntis a-Idetachcd sectional perspective view, showing; the overhead levers; and

E'g. dis a view illustratingmy invention in connection with a series of. machines driven from a: single motor-r 1,1 are two housings mounted. on at base frame 2. 3, 3- aretwomolls adapted toiboXes ilocatedtin: the housings 5 is a shafthaving; a pinion; 6;. whiclrme'sheswith gear wheel 7 on one of the rollersd. On this shaftfiis agear wheel 8 with which meshes apinion 9. on a. shaft 10 of an electric motor 11. 12 is a brake drum on the shaft 5 and extending around this drum is a brake band 13 connected at one end to a fixed pin 14 and at the opposite end to a movable block 15. 16 is a lever pivoted at 17 to a fixed point on a frame 18 to which the pin 14L is also attached. This lever 16 is connected by an adjustable rod 19 to the block of the brake band. On the outer end of the lever 16 is an adjustable weight 20. Pivoted to the frame 18 at 21 is a bell crank lever 22.

Clne. arn't 28 offlthis lever hasv an. open slot 24: intoewhich. projects a pin 25 on the lever 16: The. arm.v 26 0f the bell. crank lever is connected. tothc. frame 18 by a spring 2.7 which tends. to keep the arm 23 in engage- -ment with the pin.- 25 of the lever 16. As

soon as the arm 26 is raised by the safety mechanism, the lever 16. is released and its weight 20 will app y the brake. band to the drum 12, stopping therotationof the shaft 5,- the power, in the meantime having been cut off by theelectric switch hereinafter described.

h flountedin the housings 1 are standards 28, on which is mounted a. shaft 29. On this shaft is an arm 30 connected by a rod 31 to the arm26. 'llhisshaft 29 extends across the machine from. one standard to the other. Qnthis shaft are two arms 32. Extending; from one arm 32 to the other is a rod 33. On the shaft 29 is a toothed segment 34, which: meshes with. a toothed segment 35 on an. arm 36 secured. to a short shaft 38 journaled in one of the standards 28. This mechanism is preferably duplicated at the opposite; end and the two arms 36 are connected by a rod 37.

By this construction, any downward movements ofeither rod, 33 or 37 will cause an upward movement of. the arm 30 and this movement will raise. the arm 26 of the bell crank. lever, releasing the brake mechanism. The standards 28 are of such a height from the rollers 3 that the rods 33 and 37 are. in easy reach. of the." operator of the machine and are sov located that in the event of an operator being caught in the rolls, some portion of his body will. strike either one of the rods, stopping the machine.

In; the present instance, on one of the standards 28 is a bracket 89' carrying an electric switch 10,.the moving part of which is attached to the end of the shaft 29 so fthat,wheni the shaft is turned, the switch isthrown in order to break the current leading to the motor 11. The electric switch may be connected in series with a no-voltage release, a start'ng compensator, or oil. switch, which disconnects the current from the motor. This mechanism is not shown in the drawings.

In Figs. 1 and 2, I have illustrated my improved stop as applied to a single machine. but where there are a series of ma chines, as in Fig. 5, which are driven from a single motor, I extend the shaft 41 over the entire series of machines and connect an electric switch 4&0 to this shaft, which controls the motor 11 On this shaft is an arm 30. which connected to the mechanism which. actuates the brake band 13 on the brake drum 12, which is secured to the shaft 5. This shaft 5 is geared to a shaft 42 extending past the several machines. This shaft- 3/ isgeared to the rolls of the several machines A, B and C. in the present in stance. are connected by rods to levers on the shaft 29 of the safety stop of each machine.

By this construction, if any one of these safety stops is actuated the current from the main motor is immediately cut off and the brake will he applied, instantly stopping the entire of machines.

It will he understood that in some instances it will only be necessary to have a single trip bar, instead of two, as shown. in the drawings. This will. depend upon the type of machine to which the invention is applied.

The trip mechanism may be located at a point other than. that illustrated in the drawings without departing from the essential features of the invention.

I claim:

1. The combination of a machine having a pair of rolls; standards mounted on the machine; two safety bars; ashaft connected to both bars said shaft being directly connected to one of said bars and geared to the other bar so that on the downward more ment of either bar the shaftwill be turned in one direction an arm on the shaft; brake mechanism; and a trip for said brake mecha nism connected to said arm so that when either safety bar is moved downwards the brake will be applied.

The combination of a machine having two rollsstandards mounted on the machine; a, safety shaft extending from one standard to the other; an electric switch coupled to said shaft; a motor for driving said machine controlled by said switch; a hrake on the shaft bet-ween the motor and the machine; mechanism for applying the brake; trip mechanism for holding the brake applying mechanism out of action; and means connecting the shaft with the brake The shaft it has arms 30 which applying means so that when the safety shaft is actuated the brakes will be applied and the switch will cut off the current from the machine.

3. The combination in a safety device adapted to be located in close proximity to a machine of a shaft having two arms; a rod connecting the arms; a toothed segment on said shaft; 21 second pair of arms; a rod connecting the said arms; a toothed segment 'ea red with the first mentioned segment so that when either red is moved downwards the shaft will be moved in one direction; an arm on said shaft; brake mechanism; and means for releasing said brake mechanism connected to said last mentioned arm so that when the rod is moveddownwards the brake will be applied.

4;. The combination of a. machine; standards on the machine; a safety shaft carried by the standards; a switch connected to said shaft: a motor for driving the machine controlled by the switch; an arm on the shaft; a hell crank lever connected to the arm, one arm of said bell crank leverbeing notched; a shaft between the motor and the machine; a make drum on the shaft; a brake band on the drum; a weighted lever attached to one end of the brake band and having a pin entering: the slot in the arm of the hell crank lever; and means for turning the safety shaft whereby the switch is operated to cut out the motor and the weighted lever is released to apply the brakes to stop the machine.

5. The combination in a safety stop for a niiachine of standards in said machine; a shaft extendingacross the machine and adapted to hearings in the standards said shaft having an arm; brake mechanism for stopping the machine connected to the arm; two; arms on the'transverse shaft; asafety rod extending from one arm to the other; two short shafts, one mounted in each standard; an arm on each short shaft; a safety rod connecting the two arms; a segment on one of the said arms; and a segment on the transrerse shaft, the two segn'ients intermeshing'so that when either of the safety rods moved in one direction the brake will be applied.

JOSEPH \V. THROPP. 

